50 million inserts (100byte value + u32 key) / 1m in-memory limit

gistfile1.txt

[  t min,   t max)        ops count           %
--------------------------------------------------
[      0,       1)         49345841       98.69
[      1,       2)             3396        0.01
[      2,       3)            16003        0.03
[      3,       4)            38951        0.08
[      4,       5)            52195        0.10
[      5,       6)            55917        0.11
[      6,       7)            57549        0.12
[      7,       8)            60045        0.12
[      8,       9)            62014        0.12
[      9,      10)            63862        0.13
[     10,      12)            94510        0.19
[     12,      14)            35635        0.07
[     14,      16)            29549        0.06
[     16,      18)            26999        0.05
[     18,      20)            20567        0.04
[     20,      25)            13880        0.03
[     25,      30)             5816        0.01
[     30,      35)             1179        0.00
[     35,      40)              674        0.00
[     40,      45)              553        0.00
[     45,      50)              248        0.00
[     50,      60)              548        0.00
[     60,      70)             2184        0.00
[     70,      80)             4061        0.01
[     80,      90)             2780        0.01
[     90,     100)              901        0.00
[    100,     120)             1268        0.00
[    120,     140)             1285        0.00
[    140,     160)              925        0.00
[    160,     180)              200        0.00
[    180,     200)               79        0.00
[    200,     250)               62        0.00
[    250,     300)               29        0.00
[    300,     350)              120        0.00
[    350,     400)               53        0.00
[    400,     450)               21        0.00
[    450,     500)               28        0.00
[    500,     600)               55        0.00
[    600,     700)               12        0.00
[    700,     800)                2        0.00
[    800,     900)                3        0.00
[    900,    1000)                1        0.00
--------------------------------------------------
total:     7770601         50000000        100%
min latency       : 0.001907 * 1e-3 sec/op
avg latency       : 0.155412 * 1e-3 sec/op
max latency       : 920.124769 * 1e-3 sec/op
5.0000%  latency  : 0.050663 * 1e-3 sec/op
50.0000%  latency  : 0.506628 * 1e-3 sec/op
95.0000%  latency  : 0.962594 * 1e-3 sec/op
96.0000%  latency  : 0.972726 * 1e-3 sec/op
97.0000%  latency  : 0.982859 * 1e-3 sec/op
98.0000%  latency  : 0.992991 * 1e-3 sec/op
99.0000%  latency  : 5.779977 * 1e-3 sec/op
99.5000%  latency  : 9.909602 * 1e-3 sec/op
99.9000%  latency  : 18.732630 * 1e-3 sec/op
99.9500%  latency  : 24.310879 * 1e-3 sec/op
99.9900%  latency  : 90.488346 * 1e-3 sec/op
avg throughput    :    6435 ops/sec